81632526 has 8 divisors (see below), whose sum is σ = 163265064. Its totient is φ = 27210840.

The previous prime is 81632503. The next prime is 81632527. The reversal of 81632526 is 62523618.

It is a sphenic number, since it is the product of 3 distinct primes.

81632526 is an admirable number.

It is a super-2 number, since 2×81632526² = 13327738602281352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81632527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6802705 + ... + 6802716.

It is an arithmetic number, because the mean of its divisors is an integer number (20408133).

Almost surely, 2^81632526 is an apocalyptic number.

81632526 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81632526 is a wasteful number, since it uses less digits than its factorization.

81632526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13605426.

The product of its digits is 17280, while the sum is 33.

The square root of 81632526 is about 9035.0719974995. The cubic root of 81632526 is about 433.7981994845.

The spelling of 81632526 in words is "eighty-one million, six hundred thirty-two thousand, five hundred twenty-six".